[Oct 10, 2026 (Sat)] NPB Japanese Baseball Analysis Fighters @ Lions Preview - BeaverStats

This is an NPB analysis post written by AI.

Quick preview of Fighters @ Lions (Oct 10, 2026 (Sat)).

*Lineups aren't confirmed yet! They're usually locked in about 30 minutes before first pitch, so check the link below for the latest before betting.

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You can see the full, more detailed data on the game list.

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10/10 Fighters vs Lions

Fighters starting pitcher: Kohei Arihara Lions starting pitcher: Kaima Taira

The third-place Fighters (.557) visit the second-place Lions (.568) at Seibu Dome to open a three-game set. Barely a percentage point separates the two clubs, and the season series is dead even at 12-12. Both come in playing well: the Lions have won three straight, including 7-1 and 3-0 wins over the Marines, and the Fighters have won two in a row - though it's worth noting the Fighters last played on October 1, so they are coming off nearly nine days without game action.

The pitching matchup leans clearly toward the Lions. Taira has a 1.36 ERA and 2.27 FIP over 146 innings. That nearly one-run gap is partly driven by an 86.3% strand rate and a .245 BABIP, so he hasn't been quite as untouchable as the ERA suggests - but a 2.27 FIP is still elite, and his 13.7% SwStr shows real swing-and-miss stuff. His one weakness on the season has been walks (7.9% BB). Over his last five starts, though, he has erased even that: a 1.27 FIP, 3.1% walk rate, 18.8% SwStr and 28.2% K-BB over 36 innings, all far sharper than his season line. The one thing to keep an eye on is velocity. His average fastball has ticked down in each of his last five starts, from 156.6 km/h (topping out at 160) on August 25 to 153.7 km/h (topping out at 156) on September 29. That's still elite velocity and the results haven't suffered, but it could be a sign of late-season fatigue. At home, where he pitches today, he owns a 1.09 ERA and 1.98 FIP over 58 innings.

He has also handled the Fighters well: five starts against them this season, five wins, and a 1.41 ERA over 32 innings. His FIP in those games was a higher 2.59 and his walk rate rose to 8.8%, so the Fighters have been able to work counts against him - they just haven't come up with the big hit.

Arihara, by contrast, carries a 4.44 ERA and 3.70 FIP over 103.1 innings. With a FIP more than 0.7 below his ERA, a .311 BABIP and a 65.8% strand rate, some of that is results lagging behind the process - but over his last five starts the process has slipped too. He has a 4.26 FIP, 1.59 WHIP and .330 opponent average across 27 innings, with only 13 strikeouts for a 5.8% K-BB, and an 8.3% SwStr / 21.1% CSW that shows he isn't overpowering anyone right now. The 4-inning, 7-run outing against the Buffaloes on September 20 was the low point, and his average velocity has slipped from the 147 km/h range to 145.7. On the road, where he pitches today, he has been clearly worse than at home (45.1 IP, 5.16 ERA, 3.77 FIP, .335 BABIP). He has faced the Lions twice this season for a 4.50 ERA over 12 innings - one run over six innings on September 13, five runs over six innings back in April - which is too small a sample to read much into.

Neither lineup is confirmed yet, so this is based on each team's previous lineup. The Fighters have the stronger offense on the season (.324 wOBA, 107 wRC+), but it has cooled to a .207 average and .301 wOBA over the last five games. The bigger issue is how their middle of the order has fared against Taira. Kotaro Kiyomiya is hitting .067 over the last five and is 0-for-12 career against him, and Chusei Mannami is at .176 recently and 1-for-9 against him. Leadoff man Tatsuki Mizuno is the bright spot, with a .382 wOBA over the last five and a 4-for-9 (.444) mark against Taira, so he could be the key to getting anything started - though that's only around ten plate appearances. The Lions' offense is roughly league average on the season (.301 wOBA, 99 wRC+) and has picked up slightly over the last five (.254 average, .316 wOBA). Seiya Watanabe (.401 wOBA recently) and Shinya Hasegawa (two homers over the last five) are swinging well, while cleanup hitter Takeya Nakamura is slumping at .111.

The Lions also have the edge in the bullpen, with a 3.21 ERA over the last 10 games against the Fighters' 4.28. Recent workload is even, with both clubs at 10 innings (eight Fighters relievers, nine for the Lions). The roof takes rain out of the picture.

In summary, the two teams are dead even on the season and in head-to-head play, but today's starting matchup is lopsided: Taira with a 1.27 FIP over his last five against Arihara allowing a .330 average over the same stretch, plus a slightly better Lions bullpen. The single biggest variable is whether Arihara can cut down on the hits and get through the middle innings - the Lions' lineup is only league average, so if he pitches anywhere near his season FIP (3.70) the Fighters can keep this close late. If he gives up early runs, though, a Fighters lineup with Kiyomiya and Mannami struggling against Taira may have a hard time catching up.